题目内容

By the first day of August, 2007, the PLA ________ for eighty years.
A．foundedB．has founded
C．has been foundD．had been founded
D

试题分析：句意：到2007年8月1日为止，中国人民解放军已经成立了80年了。句中有by+过去的时间，表示到…为止，句子用过去完成时，found成立，故选D
点评：动词的时态是学习英语过程中非常重要的知识。现在完成时表示动词在过去发生对现在造成的影响。现在完成时往往和already,yet,for+一段时间，since+点时间的时间状语连用。过去完成时表示动作发生在过去的过去，句子中强调过去的动作对现在造成的影响。
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